Canada has likely already passed that milestone; the country has seen a single outbreak of more than 5,100 measles cases since October 2024, according to its health data. The U.S. is also on shaky ground. A 762-case outbreak in West Texas that started in late January 2025 was declared over on August 18. But health officials are investigating ongoing outbreaks in South Carolina and Utah. If the investigation can link those outbreaks to the original cases in Texas, and if health authorities can’t bring them under control before January 2026, the U.S. may lose its measles elimination status as well.